EP3534173A1 - Housing unit for a radar sensor - Google Patents
Housing unit for a radar sensor Download PDFInfo
- Publication number
- EP3534173A1 EP3534173A1 EP18159042.3A EP18159042A EP3534173A1 EP 3534173 A1 EP3534173 A1 EP 3534173A1 EP 18159042 A EP18159042 A EP 18159042A EP 3534173 A1 EP3534173 A1 EP 3534173A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tubular body
- radar
- shielding device
- housing
- housing arrangement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 239000000463 material Substances 0.000 claims description 12
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- 238000005259 measurement Methods 0.000 description 7
- 239000002923 metal particle Substances 0.000 description 5
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- 239000000243 solution Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
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- 239000002184 metal Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
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- 238000007740 vapor deposition Methods 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
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- 238000004026 adhesive bonding Methods 0.000 description 1
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- 238000009713 electroplating Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/023—Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
- G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
- G01S7/032—Constructional details for solid-state radar subsystems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/027—Constructional details of housings, e.g. form, type, material or ruggedness
Definitions
- the invention relates to a housing arrangement for a radar sensor and a radar sensor.
- a known housing arrangement for a radar sensor comprises a tubular body, wherein a lens is attached or attached to a distal end of the tubular body.
- the tubular body serves to fix the lens in a well-defined focal length to the radar transmitter and radar receiver.
- Such radar sensors are implemented in different areas, for example, to measure levels in containers or to measure distances of machine parts to each other. Such sensors are also used for distance measurements of vehicles for collision avoidance among themselves or for measuring a distance to the ground or to plants in agricultural applications.
- the object of the invention is to provide a solution with which the measurement can be improved.
- the housing arrangement has a screening device for radar beams arranged on a side wall of the tubular body.
- a radar sensor according to the invention comprises a housing arrangement according to the invention and a radar transmitter and / or a radar receiver.
- the inventive solution prevents radar jets emerge laterally or enter laterally. Noise due to lying in a lateral area object are therefore minimized or completely prevented.
- the solution according to the invention can be further improved by means of the following embodiments, which are each advantageous and which can be combined with one another as desired.
- the solutions mentioned may in particular also be independent of the abovementioned solution.
- the tubular body may have a constant cross-section, in particular along a measuring direction. As a result, a good concentration of the radar radiation can be achieved.
- the tubular body may in particular be designed as a hollow cylinder. Such an embodiment can be particularly easy to manufacture.
- the tubular body can be designed circular cylindrical. Such a configuration can be easy to manufacture and have good measuring properties.
- the shielding device can only be located on some parts of the tubular body. For example, selectively only parts may have a shielding device, behind which are movable parts during operation.
- the shielding device can be closed annularly around an emission axis and / or around an axis of symmetry.
- the shielding device may extend from the distal end to a proximal end.
- the proximal end may be opposite the distal end.
- a radar transmitter and / or a radar receiver can be arranged inside the housing arrangement.
- the tubular body may be integral with the lens to facilitate ease of manufacture.
- the lens may be attached to the body, such as by gluing, screwing, clamping or clipping.
- the shielding means may comprise a layer applied to the tubular body.
- the layer can be applied, for example, by vapor deposition, spraying, dipping, electroplating or similar application methods.
- the shielding device may comprise a film.
- a shielding film can be adhered.
- the film may be part of a tape or tape to allow for easy attachment.
- the shielding device may comprise a separate part from the tubular body.
- a shielding annular member may be placed on or in the tubular body. Such an element can be about pushed from the front onto or into the tubular body.
- the shielding device can be exchangeable, so that, for example, depending on the application, another, respectively adapted shielding device can be used.
- the shielding device can be arranged on an outer side of the tubular body.
- disturbing reflections that can occur, for example, when the shielding device is arranged on an inner side of the tubular body and thus in the vicinity of a radar transmitter and / or a radar receiver can thereby be reduced.
- the shielding device can also be arranged on an inner side of the tubular body, in particular if optionally occurring reflections are compensated by measurement.
- An advantage of such a configuration may be that the shielding is protected from external influences. For example, a film of such an arrangement is less likely to be damaged.
- the shielding device is located on an outer side of the tubular body, it is advantageous if a wall thickness of the side wall of the tubular body in the region of the shielding device for at least partial mutual attenuation or extinction of two radar waves which are reflected at the front and the back of the side wall, is designed. This is the case, for example, if the path difference between the two reflected waves is lambda / 2, ie half a wavelength.
- the back side is the side on which the shielding device is arranged.
- the wave is at least partially reflected at the front and at the back with the shield to almost 100 percent. In the superposition of the two reflected waves, the two are out of phase with each other and there is an at least partial extinction. As a result, an interference signal is reduced.
- An adjustment of the phase difference can be done for example by adjusting the material thickness in the shielding.
- the angle at which the waves impinge must be taken into account.
- the thickness of the sidewall may vary depending on a distance to the radar transmitter. For example, it may be thicker near the radar transmitter because radar radiation strikes the sidewall at a steeper angle. In more distant areas, the wall thickness can be smaller because the angle of impact is flatter here.
- the shielding device is arranged on the outside, then the shielding device can be covered to the outside by a protective device in order to protect it from mechanical damage.
- the tubular body may comprise, at least in sections, a material which absorbs the radar waves. Interference signals can be further reduced thereby.
- the absorbing effect can be adapted to the wavelength of the radar radiation, so that in particular radiation of the wavelength used is particularly greatly reduced.
- an absorbent material can be arranged in the region of the shielding device so that the radiation is absorbed.
- the tubular body may at least partially comprise a material containing conductive particles.
- conductive particles can absorb the radiation. It may be, for example, metal particles, nanotubes or Leitruß. The size of the metal particles or nanotubes may be adapted to the wavelength of the radar radiation to achieve good absorption.
- the material of the shielding means may comprise a material which at least partially reflects.
- the material of the shielding device may comprise metal.
- the shielding device can be made of a radar radiation absorbing material, such as metal particles, nanotubes or Leitruß. Also, the size of the metal particles or nanotubes can be adjusted to the wavelength of the radar radiation to achieve good absorption.
- a radar sensor 100 is shown with a first embodiment of a housing assembly 1.
- the housing assembly 1 comprises a tubular body 8 which extends from a proximal end 11 to a distal end 10.
- the tubular body 8 can in particular be designed as a cylinder 20, especially a circular cylinder 25.
- it is a hollow cylinder 24 having an inner space 40.
- a radar sensor 130 and a radar receiver 131 are arranged in the inner space 40 on a rear wall 9. These serve to emit radar radiation 50, or to receive the radar radiation 50 reflected back from the objects to be measured (not shown). The reflected signal can then be evaluated and thus, for example, the speed or the distance of an object can be determined.
- the radiation takes place around a radiation axis 30 approximately symmetrically.
- the emission axis 30 forms a measurement axis 32.
- the individual radar rays thereby propagate along individual propagation directions 53.
- the emission axis 30 corresponds approximately to the axis of symmetry 31 of the housing arrangement 1.
- a lens 5 is arranged at the distal end 10.
- the lens 5 is integral with the tubular one Body 8. Both can be made for example of a dielectric plastic by injection molding.
- a disturbing object 15 is present that would cause interference in previous systems due to laterally emerging radar waves, especially when the object 15 is moving.
- the signals generated thereby can only be separated from the useful signal by metrology or software technology.
- the embodiment shown has on a side wall 7 of the tubular body 8 via a shield 2. This shields the radar radiation 50 from so that they can not hit the object 15. The radar radiation 50 is reflected by the shielding device 2 and thrown back inwards and then emitted further forward.
- the shielding device 2 may be a layer 21 which has been applied to the side wall 7, for example by vapor deposition, coating or similar methods.
- the shielding device 2 may also be a film 22, which has been glued, for example, as part of an adhesive tape.
- the shielding device 2 may be a separate, mandatory conducting (metal) part 23, which has been pushed onto the housing assembly 1.
- the shielding device 2 extends around the emission axis 30 and / or around the axis of symmetry 31 in an annular manner, so that it can achieve a good protective effect.
- the shielding device 2 shown is approximately cylindrical.
- the wall thickness 90 is adapted in a region 71 on which the shielding device 2 is arranged such that, when reflected at a front side 110 of the side wall 7 and a rear side 120 the side wall 7 is at least partially extinguished the radar radiation 50.
- the necessary wall thickness 90 depends inter alia on the refractive index of the material of the side wall 7 and the angle at which the radar radiation 50 occurs in the region 71. In a front region located at the distal end 10, the wall thickness 90 due to the shallower angle, with the the radar radiation 50 strikes, be thinner than in a rear area, which is located at the proximal end 11.
- the shielding device 2 may also be attached to the inner side 81 of the side wall 7.
- the lens 5 is not integral with the housing assembly 1. It is attached to the housing assembly 1 at the distal end 10.
- the housing assembly 1 is made in this embodiment of a material containing conductive particles 140, such as metal particles, nanotubes or carbon black. Such an embodiment additionally absorbs the radar radiation 50, so that less radar radiation 50 can escape laterally or pass back into the interior space 40.
- Fig. 5 a further embodiment of a housing assembly 1 is shown, the configuration of the Fig. 1 is similar. However, the shielding device 2 extends completely along the axis 32 from the distal end 10 to the proximal end 11. This makes even better shielding possible.
- Fig. 6 Although a further embodiment is shown, in which the shielding device 2 extends from the distal end 10 to the proximal end 11, but is not closed in a ring around the longitudinal axis 32 around, but covers only a portion of this circumference. This may be sufficient for some applications and in particular have a lower weight than a completely closed configuration.
- Fig. 7 a further embodiment is shown.
- the housing assembly 1 again conductive particles 140.
- the radar sensor 100 has, outside the shielding device 2, a protective direction 60 which protects the shielding device 2 from mechanical damage.
- it may be a ring which is pushed over the shielding device 2.
- the housing assembly 1 comprises a cylindrical housing 150, in which at least one printed circuit board with the radar transmitter 130 and the radar receiver 131 and at least one plug are arranged and to which the radar sensor 100 is attached.
- the housing 150 is made of metal.
- the housing 150 may also be made of a different material, such as plastic. The housing 150 allows installation of the housing assembly 1 in round holes.
- the housing assembly 1 comprises a cubic housing 160 from which the radar sensor 100 protrudes.
- the cubic housing 160 at least one printed circuit board with the radar transmitter 130 and the radar receiver 131 and a plug can be arranged.
- the housing 160 allows installation of the housing assembly 1 at flat levels.
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
Gezeigt ist eine Gehäuseanordnung für ein Radarsensorvorderteil, umfassend einen rohrförmigen Körper, wobei an einem distalen Ende des rohrförmigen Körpers auch eine Linse anbringbar oder angebracht ist, wobei die Gehäuseanordnung eine an einer Seitenwand des rohrförmigen Körpers angeordnete Abschirmeinrichtung für Radarstrahlen aufweist. Ferner gezeigt ist ein Radarsensorvorderteil mit einer solchen Gehäuseanordnung.Shown is a housing assembly for a radar sensor front member comprising a tubular body, wherein at a distal end of the tubular body and a lens is attached or mounted, wherein the housing assembly has a arranged on a side wall of the tubular body shielding means for radar. Further shown is a radar sensor front part with such a housing arrangement.
Description
Die Erfindung betrifft eine Gehäuseanordnung für einen Radarsensor sowie einen Radarsensor.The invention relates to a housing arrangement for a radar sensor and a radar sensor.
Eine bekannte Gehäuseanordnung für einen Radarsensor umfasst einen rohrförmigen Körper, wobei an einem distalen Ende des rohrförmigen Körpers eine Linse anbringbar oder angebracht ist. Der rohrförmige Körper dient dazu, die Linse in einer genau definierten Brennweite zum Radarsender und Radarempfänger zu fixieren.A known housing arrangement for a radar sensor comprises a tubular body, wherein a lens is attached or attached to a distal end of the tubular body. The tubular body serves to fix the lens in a well-defined focal length to the radar transmitter and radar receiver.
Solche Radarsensoren werden in verschiedenen Bereichen umgesetzt, beispielsweise um Füllstände in Behältern zu messen oder Abstände von Maschinenteilen zueinander zu vermessen. Auch für Distanzmessungen von Fahrzeugen zur Kollisionsvermeidung untereinander oder zur Messung eines Abstandes zum Boden oder zu Pflanzen bei landwirtschaftlichen Anwendungen werden solche Sensoren verwendet.Such radar sensors are implemented in different areas, for example, to measure levels in containers or to measure distances of machine parts to each other. Such sensors are also used for distance measurements of vehicles for collision avoidance among themselves or for measuring a distance to the ground or to plants in agricultural applications.
Aufgabe der Erfindung ist es, eine Lösung bereitzustellen, mit der die Messung verbessert werden kann.The object of the invention is to provide a solution with which the measurement can be improved.
Erfindungsgemäß wird dies dadurch gelöst, dass die Gehäuseanordnung eine an einer Seitenwand des rohrförmigen Körpers angeordnete Abschirmeinrichtung für Radarstrahlen aufweist.This is achieved according to the invention in that the housing arrangement has a screening device for radar beams arranged on a side wall of the tubular body.
Ein erfindungsgemäßer Radarsensor umfasst eine erfindungsgemäße Gehäuseanordnung und einen Radarsender und/oder einen Radarempfänger.A radar sensor according to the invention comprises a housing arrangement according to the invention and a radar transmitter and / or a radar receiver.
Durch die erfindungsgemäße Lösung wird verhindert, dass Radarstrahlen seitlich austreten oder seitlich eintreten. Störsignale durch in einem seitlichen Bereich liegende Objekt werden daher minimiert oder ganz verhindert.The inventive solution prevents radar jets emerge laterally or enter laterally. Noise due to lying in a lateral area object are therefore minimized or completely prevented.
Die erfindungsgemäße Lösung kann mit den folgenden, jeweils für sich vorteilhaften und beliebig miteinander kombinierbaren Ausgestaltungen und Weiterentwicklungen weiter verbessert werden. Die genannten Lösungen können insbesondere auch unabhängig von der oben genannten Lösung sein.The solution according to the invention can be further improved by means of the following embodiments, which are each advantageous and which can be combined with one another as desired. The solutions mentioned may in particular also be independent of the abovementioned solution.
Der rohrförmige Körper kann einen gleich bleibenden Querschnitt aufweisen, insbesondere entlang einer Messrichtung. Dadurch kann eine gute Bündelung der Radarstrahlung erzielt werden.The tubular body may have a constant cross-section, in particular along a measuring direction. As a result, a good concentration of the radar radiation can be achieved.
Der rohrförmige Körper kann insbesondere hohlzylindrisch ausgestaltet sein. Eine solche Ausgestaltung kann besonders einfach herzustellen sein. Insbesondere kann der rohrförmige Körper kreiszylindrisch ausgestaltet sein. Eine solche Ausgestaltung kann einfach herzustellen sein und gute Messeigenschaften aufweisen. Die Abschirmeinrichtung kann sich nur an einigen Teilen des rohrförmigen Körpers befinden. Beispielsweise können selektiv nur Teile eine Abschirmeinrichtung aufweisen, hinter denen sich im Betrieb bewegliche Teile befinden.The tubular body may in particular be designed as a hollow cylinder. Such an embodiment can be particularly easy to manufacture. In particular, the tubular body can be designed circular cylindrical. Such a configuration can be easy to manufacture and have good measuring properties. The shielding device can only be located on some parts of the tubular body. For example, selectively only parts may have a shielding device, behind which are movable parts during operation.
Um eine besonders gute Abschirmung zu verschiedenen Richtungen hin zu erreichen, kann die Abschirmeinrichtung um eine Abstrahlachse und/oder um eine Symmetrieachse herum ringförmig geschlossen sein.In order to achieve a particularly good shielding in different directions, the shielding device can be closed annularly around an emission axis and / or around an axis of symmetry.
In einer vorteilhaften Ausgestaltung kann sich die Abschirmeinrichtung von dem distalen Ende zu einem proximalen Ende erstrecken. Dadurch ist eine besonders gute Abschirmung entlang einer Messrichtung möglich. Das proximale Ende kann dem distalen Ende gegenüber liegen. Am proximalen Ende können zum Beispiel im Inneren der Gehäuseanordnung ein Radarsender und/oder ein Radarempfänger angeordnet sein.In an advantageous embodiment, the shielding device may extend from the distal end to a proximal end. As a result, a particularly good shielding along a measuring direction is possible. The proximal end may be opposite the distal end. At the proximal end, for example, a radar transmitter and / or a radar receiver can be arranged inside the housing arrangement.
Der rohrförmige Körper kann einteilig mit der Linse sein, um eine einfache Herstellung zu ermöglichen. In einer anderen Ausgestaltung kann die Linse an dem Körper angebracht werden, beispielsweise durch Ankleben, Schrauben, Klemmen oder Anklippen.The tubular body may be integral with the lens to facilitate ease of manufacture. In another embodiment, the lens may be attached to the body, such as by gluing, screwing, clamping or clipping.
Vorteilhafterweise kann die Abschirmeinrichtung eine auf dem rohrförmigen Körper aufgebrachte Schicht umfassen. Eine solche Ausgestaltung kann besonders leicht sein. Die Schicht kann beispielsweise durch Aufdampfen, Aufsprühen, Eintauchen, galvanisches Aufbringen oder ähnliche Auftragsverfahren aufgebracht werden.Advantageously, the shielding means may comprise a layer applied to the tubular body. Such a configuration can be particularly easy. The layer can be applied, for example, by vapor deposition, spraying, dipping, electroplating or similar application methods.
In einer weiteren vorteilhaften Ausgestaltung kann die Abschirmeinrichtung eine Folie umfassen. Eine solche Ausgestaltung kann besonders einfach herzustellen sein. Beispielsweise kann eine abschirmende Folie angeklebt werden. Die Folie kann Teil eines Tapes oder Klebebands sein, um eine einfache Anbringung zu ermöglichen.In a further advantageous embodiment, the shielding device may comprise a film. Such an embodiment can be particularly easy to manufacture. For example, a shielding film can be adhered. The film may be part of a tape or tape to allow for easy attachment.
Alternativ oder zusätzlich kann die Abschirmeinrichtung ein von dem rohrförmigen Körper separates Teil umfassen. Beispielsweise kann ein abschirmendes ringförmiges Element auf oder in den rohrförmigen Körper gebracht werden. Ein solches Element kann etwa von vorn auf oder in den rohrförmigen Körper geschoben werden. Bei einer solchen Ausgestaltung kann die Abschirmeinrichtung austauschbar sein, so dass zum Beispiel je nach Anwendung eine andere, jeweils angepasste Abschirmeinrichtung verwendet werden kann.Alternatively or additionally, the shielding device may comprise a separate part from the tubular body. For example, a shielding annular member may be placed on or in the tubular body. Such an element can be about pushed from the front onto or into the tubular body. In such an embodiment, the shielding device can be exchangeable, so that, for example, depending on the application, another, respectively adapted shielding device can be used.
In einer vorteilhaften Ausgestaltung kann die Abschirmeinrichtung an einer Außenseite des rohrförmigen Körpers angeordnet sein. Dadurch können insbesondere störende Reflexe verringert werden, die zum Beispiel auftreten können, wenn die Abschirmeinrichtung an einer Innenseite des rohrförmigen Körpers und damit in der Nähe eines Radarsenders und/oder eines Radarempfängers angeordnet ist.In an advantageous embodiment, the shielding device can be arranged on an outer side of the tubular body. In particular, disturbing reflections that can occur, for example, when the shielding device is arranged on an inner side of the tubular body and thus in the vicinity of a radar transmitter and / or a radar receiver can thereby be reduced.
Alternativ oder zusätzlich kann die Abschirmeinrichtung auch an einer Innenseite des rohrförmigen Körpers angeordnet sein, insbesondere wenn gegebenenfalls auftretende Reflexe messtechnisch kompensiert werden. Vorteilhaft an einer solchen Ausgestaltung kann sein, dass die Abschirmeinrichtung vor äußeren Einflüssen geschützt ist. Beispielsweise kann eine Folie einer solchen Anordnung weniger leicht beschädigt werden.Alternatively or additionally, the shielding device can also be arranged on an inner side of the tubular body, in particular if optionally occurring reflections are compensated by measurement. An advantage of such a configuration may be that the shielding is protected from external influences. For example, a film of such an arrangement is less likely to be damaged.
Befindet sich die Abschirmeinrichtung an einer Außenseite des rohrförmigen Körpers, so ist es vorteilhaft, wenn eine Wandstärke der Seitenwand des rohrförmigen Körpers im Bereich der Abschirmeinrichtung zur zumindest teilweisen gegenseitigen Abschwächung oder Auslöschung zweier Radarwellen, die an der Vorderseite und der Rückseite der Seitenwand reflektiert werden, ausgestaltet ist. Dies ist etwa der Fall, wenn der Wegunterschied der beiden reflektierten Wellen Lambda/2, also eine halbe Wellenlänge, beträgt. Die Rückseite ist hierbei die Seite, an der die Abschirmeinrichtung angeordnet ist. Die Welle wird an der Vorderseite zumindest teilweise und an der Rückseite mit der Abschirmung zu fast 100 Prozent reflektiert. Bei der Überlagerung der beiden reflektierten Wellen sind die beiden zueinander phasenverschoben und es tritt eine zumindest teilweise Auslöschung auf. Dadurch ist ein Störsignal verringert. Eine Anpassung der Phasendifferenz kann zum Beispiel durch eine Anpassung der Materialdicke im Bereich der Abschirmung erfolgen. Dabei ist auch der Winkel, unter dem die Wellen auftreffen, zu beachten. Die Dicke der Seitenwand kann in Abhängigkeit von einem Abstand zum Radarsender verschieden sein. Beispielsweise kann sie in der Nähe des Radarsenders dicker sein, da die Radarstrahlung hier unter einem steileren Winkel auf die Seitenwand trifft. In weiter entfernten Bereichen kann die Wanddicke kleiner sein, da der Auftreffwinkel hier flacher ist.If the shielding device is located on an outer side of the tubular body, it is advantageous if a wall thickness of the side wall of the tubular body in the region of the shielding device for at least partial mutual attenuation or extinction of two radar waves which are reflected at the front and the back of the side wall, is designed. This is the case, for example, if the path difference between the two reflected waves is lambda / 2, ie half a wavelength. The back side is the side on which the shielding device is arranged. The wave is at least partially reflected at the front and at the back with the shield to almost 100 percent. In the superposition of the two reflected waves, the two are out of phase with each other and there is an at least partial extinction. As a result, an interference signal is reduced. An adjustment of the phase difference can be done for example by adjusting the material thickness in the shielding. At the same time, the angle at which the waves impinge must be taken into account. The thickness of the sidewall may vary depending on a distance to the radar transmitter. For example, it may be thicker near the radar transmitter because radar radiation strikes the sidewall at a steeper angle. In more distant areas, the wall thickness can be smaller because the angle of impact is flatter here.
Ist die Abschirmeinrichtung außen angeordnet, so kann die Abschirmeinrichtung nach außen hin von einer Schutzvorrichtung abgedeckt sein, um sie vor mechanischen Beschädigungen zu schützen.If the shielding device is arranged on the outside, then the shielding device can be covered to the outside by a protective device in order to protect it from mechanical damage.
In einer vorteilhaften Ausgestaltung kann der rohrförmige Körper zumindest abschnittsweise ein Material umfassen, das die Radarwellen absorbiert. Störsignale können dadurch weiter reduziert werden. Insbesondere kann die absorbierende Wirkung an die Wellenlänge der Radarstrahlung angepasst sein, sodass insbesondere Strahlung der verwendeten Wellenlänge besonders stark verringert wird. Insbesondere kann ein absorbierendes Material im Bereich der Abschirmeinrichtung angeordnet sein, sodass die Strahlung absorbiert wird.In an advantageous embodiment, the tubular body may comprise, at least in sections, a material which absorbs the radar waves. Interference signals can be further reduced thereby. In particular, the absorbing effect can be adapted to the wavelength of the radar radiation, so that in particular radiation of the wavelength used is particularly greatly reduced. In particular, an absorbent material can be arranged in the region of the shielding device so that the radiation is absorbed.
Beispielsweise kann der rohrförmige Körper zumindest abschnittsweise ein Material umfassen, das leitende Partikel enthält. Solche leitenden Partikel können die Strahlung absorbieren. Es kann sich beispielsweise um Metallpartikel, Nanotubes oder Leitruß handeln. Die Größe der Metallpartikel oder der Nanotubes kann auf die Wellenlänge der Radarstrahlung angepasst sein, um eine gute Absorption zu erreichen.For example, the tubular body may at least partially comprise a material containing conductive particles. Such conductive particles can absorb the radiation. It may be, for example, metal particles, nanotubes or Leitruß. The size of the metal particles or nanotubes may be adapted to the wavelength of the radar radiation to achieve good absorption.
Das Material der Abschirmungseinrichtung kann ein Material umfassen, das zumindest teilweise reflektiert. Beispielsweise kann das Material der Abschirmeinrichtung Metall umfassen. In einer weiteren bevorzugten Ausführungsform kann die Abschirmeinrichtung aus einem die Radarstrahlung absorbierenden Material ausgeführt sein, wie beispielsweise Metallpartikel, Nanotubes oder Leitruß. Ebenfalls kann die Größe der Metallpartikel oder der Nanotubes auf die Wellenlänge der Radarstrahlung angepasst sein, um eine gute Absorption zu erreichen.The material of the shielding means may comprise a material which at least partially reflects. For example, the material of the shielding device may comprise metal. In a further preferred embodiment, the shielding device can be made of a radar radiation absorbing material, such as metal particles, nanotubes or Leitruß. Also, the size of the metal particles or nanotubes can be adjusted to the wavelength of the radar radiation to achieve good absorption.
Im Folgenden wird die Erfindung anhand vorteilhafter Ausgestaltungen mit Bezug auf die Zeichnungen beispielhaft näher erläutert. Die dabei dargestellten vorteilhaften Weiterentwicklungen und Ausgestaltungen sind jeweils voneinander unabhängig und können beliebig miteinander kombiniert werden, je nachdem, wie dies im Anwendungsfall notwendig ist.In the following, the invention will be explained in more detail by way of example with reference to advantageous embodiments with reference to the drawings. The illustrated advantageous developments and refinements are each independent of each other and can be combined with each other, depending on how this is necessary in the application.
Es zeigen:
- Fig. 1
- eine schematische Querschnittsansicht einer ersten Ausführungsform einer Gehäuseanordnung eines Teilbereichs für einen Radarsensor;
- Fig. 2
- ein Diagramm eines Signals in einer ersten Ebene mit und ohne Abschirmeinrichtung;
- Fig.3
- ein Diagramm des Signals in einer zweiten Ebene mit und ohne Abschirmeinrichtung;
- Fig. 4
- eine schematische Querschnittsansicht einer zweiten Ausführungsform;
- Fig. 5
- eine schematische Querschnittsansicht einer dritten Ausführungsform;
- Fig. 6
- eine schematische Querschnittsansicht einer vierten Ausführungsform;
- Fig. 7
- eine schematische Querschnittsansicht einer fünften Ausführungsform.
- Fig. 8
- eine schematische Querschnittsansicht einer Ausführungsform einer Gehäuseanordnung eines zylinderförmigen Radarsensors und
- Fig. 9
- eine schematische Querschnittsansicht einer Ausführungsform einer Gehäuseanordnung eines kubisch Radarsensors.
- Fig. 1
- a schematic cross-sectional view of a first embodiment of a housing arrangement of a portion for a radar sensor;
- Fig. 2
- a diagram of a signal in a first plane with and without shielding;
- Figure 3
- a diagram of the signal in a second plane with and without shielding;
- Fig. 4
- a schematic cross-sectional view of a second embodiment;
- Fig. 5
- a schematic cross-sectional view of a third embodiment;
- Fig. 6
- a schematic cross-sectional view of a fourth embodiment;
- Fig. 7
- a schematic cross-sectional view of a fifth embodiment.
- Fig. 8
- a schematic cross-sectional view of an embodiment of a housing arrangement of a cylindrical radar sensor and
- Fig. 9
- a schematic cross-sectional view of an embodiment of a housing arrangement of a cubic radar sensor.
In
Der rohrförmige Körper 8 kann insbesondere als ein Zylinder 20, speziell ein Kreiszylinder 25 ausgestaltet sein. Insbesondere handelt es sich um einen Hohlzylinder 24, der einen Innenraum 40 aufweist.The
Am proximalen Ende 11 sind in dem Innenraum 40 an einer Rückwand 9 ein Radarsensor 130 und ein Radarempfänger 131 angeordnet. Diese dienen dazu, Radarstrahlung 50 auszusenden, bzw. die von den zu messenden Objekten (nicht gezeigt) zurückgeworfene Radarstrahlung 50 zu empfangen. Das zurückgeworfene Signal kann dann ausgewertet werden und so zum Beispiel die Geschwindigkeit oder die Entfernung eines Objekts ermittelt werden. Die Abstrahlung erfolgt um eine Abstrahlachse 30 herum etwa symmetrisch. Die Abstrahlachse 30 bildet eine Meßachse 32. Die einzelnen Radarstrahlen breiten sich dabei entlang individueller Ausbreitungsrichtungen 53 aus.At the
Die Abstrahlachse 30 entspricht zugleich etwa der Symmetrieachse 31 der Gehäuseanordnung 1.At the same time, the
Um die Radarstrahlung 50 zu bündeln, ist an dem distalen Ende 10 eine Linse 5 angeordnet. In dem gezeigten Beispiel ist die Linse 5 einteilig mit dem rohrförmigen Körper 8. Beides kann zum Beispiel aus einem dielektrischen Kunststoff durch Spritzgießen hergestellt sein.In order to focus the
Neben dem Radarsensor 100 ist ein störendes Objekt 15 vorhanden, dass aufgrund von seitlich austretenden Radarwellen bei bisherigen Systemen Störungen verursachen würde, insbesondere wenn sich das Objekt 15 bewegt. Die dadurch erzeugten Signale lassen sich messtechnisch oder softwaretechnisch nur schlecht vom Nutzsignal trennen.In addition to the
Die gezeigte Ausführungsform verfügt an einer Seitenwand 7 des rohrförmigen Körpers 8 über eine Abschirmeinrichtung 2. Diese schirmt die Radarstrahlung 50 so ab, dass sie nicht auf das Objekt 15 treffen kann. Die Radarstrahlung 50 wird von der Abschirmeinrichtung 2 reflektiert und nach innen zurückgeworfen und dann weiter nach vorne abgestrahlt werden.The embodiment shown has on a
Die Abschirmeinrichtung 2 kann eine Schicht 21 sein, die auf der Seitenwand 7 aufgebracht wurde, beispielsweise durch Aufdampfen, Auftragen oder ähnliche Verfahren. Die Abschirmeinrichtung 2 kann auch eine Folie 22 sein, die zum Beispiel als Teil eines Klebebandes aufgeklebt wurde. In einer weiteren Ausgestaltung kann die Abschirmeinrichtung 2 ein separates, zwingend leitendes (Metall) Teil 23 sein, das auf die Gehäuseanordnung 1 aufgeschoben wurde.The
Vorteilhafterweise erstreckt sich die Abschirmeinrichtung 2 um die Abstrahlachse 30 und/oder um die Symmetrieachse 31 herum ringförmig geschlossen, sodass sie eine gute Schutzwirkung erzielen kann. Die gezeigte Abschirmeinrichtung 2 ist etwa zylinderförmig.Advantageously, the
Bei der Ausgestaltung der
In einer alternativen Ausgestaltung kann die Abschirmeinrichtung 2 auch an der Innenseite 81 der Seitenwand 7 angebracht sein.In an alternative embodiment, the
In den
In der
In
In
In
In
In
Claims (14)
Priority Applications (2)
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EP18159042.3A EP3534173B1 (en) | 2018-02-28 | 2018-02-28 | Housing unit for a radar sensor |
US16/281,106 US11175379B2 (en) | 2018-02-28 | 2019-02-21 | Housing arrangement for a radar sensor |
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EP18159042.3A EP3534173B1 (en) | 2018-02-28 | 2018-02-28 | Housing unit for a radar sensor |
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EP3534173A1 true EP3534173A1 (en) | 2019-09-04 |
EP3534173B1 EP3534173B1 (en) | 2023-08-02 |
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DE102021130867A1 (en) * | 2021-11-25 | 2023-05-25 | Zf Cv Systems Europe Bv | Compressed air connection device of an air spring bellows |
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EP3534173B1 (en) | 2023-08-02 |
US20190265329A1 (en) | 2019-08-29 |
US11175379B2 (en) | 2021-11-16 |
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